Antifreeze solution



Patented Feb. 26; 1935 v r v UNITED STATES PATENT OFFICE ANTIFBEEZE SOLUTION Robert W. Cairns, Baltimore, Md., "Signor to- The Firestone Tire & Rubber Company, Akron, Ohio, a corporationoi Ohio No Drawing. Application February 1 1, 1933,

Serial No. 656,383

4 Claims. (Cl. 252-) This invention relates to anti-freeze solutions, Tetrahydrofuriuryl alcohol may be added to and more especially it relates to anti-freeze solu-' aqueous solutions of glycerine for eflfectively re tions' suitable for use in the cooling systems of ducing the viscosity of the latter. The freezing motor vehicles. points of aqueous solutions of several mixtures of 5 Heretofore anti-freeze solutions of the chartetrahydroi'uri'uryl alcohol (T. H. F. A.) and I acter mentioned have been of two general classes, glycerine .are given below. The freezing points the highly volatile fluids such as methyl alcohol recorded are temperatures at which crystals will or ethyl alcohol, and the thick, syrupy nonjust appear and continue to grow. The glycerine volatile fluids such as ethylene glycol or glycerine. used is of regular anti-freeze grade and tests 98% The volatile fluids are open to the objection that according 'to specific gravity measurements. 10

they boil away and require constant replacement to perform efiective service. The permanent Freezing points anti-freeze solutions of the nature of glycerine have a. strong tendency to foam, and have relacommflon or 1 tively high viscosity as compared to water or the anti-freeze simple alcohols. This is especially true at subnormal temperatures. Consequently some of the p b permanent anti-freeze materials on the market 25% 50% have other ingredients mixed with the glycerine to overcome these objections. 1007 G1 1 1. 1 9. hf. 1 g. :5. 3 1 2 The chief objects of the invention are to pro-' 75 1 j vide an improved economical, permanent antio' freeze solution; to produce an anti-freeze solugffi g tion of low viscosity; andto obviate foaming of 23, $1 ,oo ll 18.5-13.5 7.7-23. 4.4- $27.4 the r I lw'kyltnii -o. 19.6-12. 10.4-20. -4. 48.2-20.0

The improved anti-freeze solution constituting this invention consists of a mixture of glycerine and tetrahydrofurfuryl alcohol, 041-110311 01 In the above mixtures the normal foaming The latter has a boiling point of 177-178 centitendency f the yc e s overcome and its grade and a density of 1.0514. It is a relatively Viscosity e Tetrahydroful'ful'yl 0 1 01 80 non-volatile material, which is a very desirable may likewise e mixed w aqueous solutions of characteristic in permanent anti-freezes. It is ethylene. glycol with advantageous results- An? also contemplated that aqueous solutions of tetraof the above solutions have t e further edventese hydrofurfuryl alcohol or the latter material unof being. non-Volatile, d c omical to mantl diluted may also be used as anti-freeze liquids factulein the cooling systems of internal combustion Modification may be resorted to without de- Conocntmtion of aqueous solution 1 engines. parting from the spirit of the invention or the Mixtures of tetrahydrofurfuryl alcohol and Scope Offlle pp claims- 40 water give the following ireezing points: What is claimedis:

y 1. An anti-freeze fluid comprising an aqueous Percent by Freezing Fmozing solution of tetrahydroturturyl alcohol, said solu- Wlmm p int tionbeing relatively non-volatile, non-foaming, non-corrosive, and retaining its low viscosity at m Lglow temperatures. a

I m 1 228 2. An anti-freeze fluid comprising an aqueous g 3 solution 01' tetrahydrofuriuryl alcohol and -2os -4It g ycerine. 7 r 2% :Egg 3. An anti-freeze fluid comprising an aqueous 4 solution of tetrahydroiuriuryi alcohol and ethylno one glycol.

High concentrations 01' aqueous solutions 0! 4. An. anti-freeze fluid comprising an aqueous tetlahydroturiuryl alcohol or tetrahydrofuriuryl solutionv of tetrahydroturturyl alcohol. ethylene alcohol undiluted are especially advantageous for glycol and glycerine.

' use in the cooling systems or airplanes. ROBERT w. CAIRNS. 

